Steem Dollars are liquid stable-value currency tokens designed to be pegged to $1 USD. Steem Dollars can be traded with STEEM and transferred to other accounts for commerce or exchange.
Sphere (SPHR) is a decentralized peer-to-peerpayment network, secured through a proof of stake (pos) consensus blockchain. (sphere) is designed to act as an efficient and secure means of commerce, while also serving as an appreciating token for traders and long-term holders.